STA is a digital signal which is used by the The STA circuit is wired to the ECU as shown
ECU to determine if the engine is being in the diagram. The ECU will sense cranking cranked. The signal is generated at the ST1 voltage at the STA terminal whenever the terminal of the ignition switch and is used by ignition is switched to the "start" position as the ECU primarily to increase fuel injection long as the neutral or clutch switch is closed. volume during cranking.
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